July in Santiago de Compostela is the sunniest month of the year. In July, the weather in Santiago de Compostela is typically warm. Average daily high temperature in July is about 21 degrees above zero. On average, Santiago de Compostela has 17 sunny, 10 partly cloudy, and 4 rainy days in July. The rains are usually light. July as well as August and September is considered the most comfortable time to visit Santiago de Compostela.